one week after the horrifying shootings in newtown, connecticut, which left 20 children and six adults dead, the nation's top today to remember the victims, but it was also the day the country's leading gun lobby, the national rifle association, chose to lay out its case for why armed guards at every u.s. school would help prevent similar tragedies in the future. the bbc's north america editor reports. >> the church bells tolled out the exact time when a week ago a young man with an assault rifle began his massacre of children. they stood in prayer and in silence in the rain. in a town still numb, the bells tolled 26 times, one for each of the victims of the school. inside the white house, president obama and his staff since silent for a minute. beyond the grave, resolution. in a new video, he has promised he will push for a ban on assault rifles. >> i will do everything in my power as president to advance these efforts. if there's even one thing we can do as a country to protect our children, we have a responsibility to try. >> shame on the nra. >> there are those who blame the nation